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IR3651SPBF Datasheet(PDF) 1 Page - International Rectifier

Part No. IR3651SPBF
Description  HIGH VOLTAGE SYNCHRONOUS PWM BUCK CONTROLLER
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Maker  IRF [International Rectifier]
Homepage  http://www.irf.com
Logo IRF - International Rectifier

IR3651SPBF Datasheet(HTML) 1 Page - International Rectifier

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IR3651SPbF
10/11/2006
HIGH VOLTAGE SYNCHRONOUS PWM BUCK CONTROLLER
Description
The IR3651 is a high voltage PWM controller
designed for high performance synchronous Buck
DC/DC applications. The IR3651 drives a pair of
external N-MOSFETs using a programmable
switching frequency up to 400kHz allows flexibility
to tune the operation of the IC to meet system
level requirements, and synchronization allows
the simplification of system level filter design. The
output voltage can be precisely regulated using
the internal 1.25V reference voltage for low
voltage applications. Protection such as under
voltage lockout and hiccup current limit are
provided to give required system level security in
the event of fault conditions.
Features
High Voltage Operating up to 75V
Programmable Switching Frequency up to 400kHz
1A Output Drive Capability
Precision Reference Voltage (1.25V)
Programmable Soft-Start
Programmable Over Current Protection
Hiccup Current Limit Using MOSFET R
DS(on)
sensing
External Frequency Synchronization
14-pin SOIC Package
Applications
48V non-isolated DC to DC Converter
Embedded Telecom Systems
Networking and Computing Voltage Regulator
Distributed Point of Load Power Architectures
General high voltage DC/DC Converters
Typical application Circuit
ORDERING INFORMATION
PKG
PACKAGE
PIN
PARTS
PARTS
T&R
DESIG DESCRIPTION
COUNT PER TUBE
PER REEL
ORIANTAION
S
IR3651SPBF
14
55
-------
S
IR3651STRPBF
14
--------
2500
Fig A
ROCset
IR3651S
Vcc
Vb
HDrv
LDrv
Fb
Gnd
Comp
SS/SD
C2
C3
C7
R4
Q1
Q2
L1
Vout
C8
Vaux=12V
PGnd
SYNC
Vin: 12V-75V
DRVcc
C1
R1
R2
Vs
C4
C6
Rt
R5
C5
C10
C9
R3
OCset
Data Sheet No.PD94720


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